function probs = getSiteTransitionProbs( tree, copynums, site )

counts = countSiteCopyNumChanges(tree, copynums, site);
probs = zeros(size(counts, 1), size(counts, 2));

for i = 1:size(counts, 1)
    tot = sum(counts(i, :));
    if (tot ~= 0)
        probs(i, :) = counts(i, :) / tot;
    end
end

end

